diff --git a/src/libs/utils/fileutils.cpp b/src/libs/utils/fileutils.cpp
index fb70cbf85af..d90775e5033 100644
--- a/src/libs/utils/fileutils.cpp
+++ b/src/libs/utils/fileutils.cpp
@@ -27,7 +27,6 @@
 #include "savefile.h"
 
 #include "algorithm.h"
-#include "hostosinfo.h"
 #include "qtcassert.h"
 
 #include <QDir>
diff --git a/src/libs/utils/fileutils.h b/src/libs/utils/fileutils.h
index fc6d80f7297..43f7fc2e86e 100644
--- a/src/libs/utils/fileutils.h
+++ b/src/libs/utils/fileutils.h
@@ -27,6 +27,8 @@
 
 #include "utils_global.h"
 
+#include "hostosinfo.h"
+
 #include <QCoreApplication>
 #include <QXmlStreamWriter> // Mac.
 #include <QMetaType>
@@ -233,4 +235,18 @@ QT_BEGIN_NAMESPACE
 QTCREATOR_UTILS_EXPORT uint qHash(const Utils::FileName &a);
 QT_END_NAMESPACE
 
+namespace std {
+template<> struct hash<Utils::FileName>
+{
+    using argument_type = Utils::FileName;
+    using result_type = size_t;
+    result_type operator()(const argument_type &fn) const
+    {
+        if (Utils::HostOsInfo::fileNameCaseSensitivity() == Qt::CaseInsensitive)
+            return hash<string>()(fn.toString().toUpper().toStdString());
+        return hash<string>()(fn.toString().toStdString());
+    }
+};
+} // namespace std
+
 Q_DECLARE_METATYPE(Utils::FileName)